CVE-2020-26941: Software Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-3855-w94p-4hp9
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CWE-276
Published
Advisory Summary

CVE-2020-26941 is a MODERATE security vulnerability vulnerability (CWE-276: Incorrect Default Permissions) affecting Software libraries in the Maven ecosystem. The weakness occurs when during installation, installed file permissions are set to allow anyone to modify those files.. Remediation is available in the latest vendor maintenance releases.

CVE-2020-26941 at a Glance

CVE Identifier CVE-2020-26941
GHSA Identifier GHSA-3855-w94p-4hp9
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-276: Incorrect Default Permissions
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2020-26941

To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2020-26941, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-276: Incorrect Default Permissions, where during installation, installed file permissions are set to allow anyone to modify those files. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

A local (authenticated) low-privileged user can exploit a behavior in an ESET installer to achieve arbitrary file overwrite (deletion) of any file via a symlink, due to insecure permissions. The possibility of exploiting this vulnerability is limited and can only take place during the installation phase of ESET products. Furthermore, exploitation can only succeed when Self-Defense is disabled. Affected products are: ESET NOD32 Antivirus, ESET Internet Security, ESET Smart Security, ESET Smart Security Premium versions 13.2 and lower; ESET Endpoint Antivirus, ESET Endpoint Security, ESET NOD32 Antivirus Business Edition, ESET Smart Security Business Edition versions 7.3 and lower; ESET File Security for Microsoft Windows Server, ESET Mail Security for Microsoft Exchange Server, ESET Mail Security for IBM Domino, ESET Security for Kerio, ESET Security for Microsoft SharePoint Server versions 7.2 and lower.

References

NVD — CVE-2020-26941 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-26941
support.eset.com/en/ca7794-local-pri... WEB
https://support.eset.com/en/ca7794-local-privilege-escalation-vulnerability-fixed-in-eset-products-for-windows

Frequently Asked Questions

What is CVE-2020-26941?
CVE-2020-26941 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-276: Incorrect Default Permissions.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2020-26941?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2020-26941?
CVE-2020-26941 is classified under CWE-276: Incorrect Default Permissions (During installation, installed file permissions are set to allow anyone to modify those files.).
How can I check Maven dependencies for CVE-2020-26941?
Run the dependency tree command: 'mvn dependency:tree'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-3855-w94p-4hp9",
  "modified" : "2022-05-24T17:40:09Z",
  "published" : "2022-05-24T17:40:09Z",
  "aliases" : [ "CVE-2020-26941" ],
  "details" : "A local (authenticated) low-privileged user can exploit a behavior in an ESET installer to achieve arbitrary file overwrite (deletion) of any file via a symlink, due to insecure permissions. The possibility of exploiting this vulnerability is limited and can only take place during the installation phase of ESET products. Furthermore, exploitation can only succeed when Self-Defense is disabled. Affected products are: ESET NOD32 Antivirus, ESET Internet Security, ESET Smart Security, ESET Smart Security Premium versions 13.2 and lower; ESET Endpoint Antivirus, ESET Endpoint Security, ESET NOD32 Antivirus Business Edition, ESET Smart Security Business Edition versions 7.3 and lower; ESET File Security for Microsoft Windows Server, ESET Mail Security for Microsoft Exchange Server, ESET Mail Security for IBM Domino, ESET Security for Kerio, ESET Security for Microsoft SharePoint Server versions 7.2 and lower.",
  "severity" : [ ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-26941"
  }, {
    "type" : "WEB",
    "url" : "https://support.eset.com/en/ca7794-local-privilege-escalation-vulnerability-fixed-in-eset-products-for-windows"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-276" ],
    "severity" : "MODERATE",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2021-01-26T18:15:00Z"
  }
}